package com.sky.service.impl;

import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.entity.User;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.result.Result;
import com.sky.service.ShoppingCartService;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

@Service
public class ShoppingCartServiceImpl implements ShoppingCartService {
    @Autowired
    private ShoppingCartMapper shoppingCartMapper;
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private SetmealMapper setmealMapper;

    /**
     * 添加购物车
     * @param shoppingCartDTO
     */
    @Override
    public void addShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
        //只能查询自己的购物车数据
        shoppingCart.setUserId(BaseContext.getCurrentId());
        //判断当前商品是否在购物车中
        List<ShoppingCart> shoppingCartList = shoppingCartMapper.list(shoppingCart);
        if (shoppingCartList != null && shoppingCartList.size() == 1){
            //如果存在，就更新数量，数量加一
            shoppingCart = shoppingCartList.get(0);
            shoppingCart.setNumber(shoppingCart.getNumber() + 1);
            shoppingCartMapper.updateNumberById(shoppingCart);
        }else {
            //如果不存在就插入数据,数量为1
            Long dishId = shoppingCartDTO.getDishId();
            if (dishId != null){
                //添加购物车的是菜品
                Dish dish = dishMapper.getById(dishId);
                shoppingCart.setName(dish.getName());
                shoppingCart.setImage(dish.getImage());
                shoppingCart.setAmount(dish.getPrice());
            }else {
                //添加购物车的是套餐
                Setmeal setmeal = setmealMapper.getById(shoppingCartDTO.getSetmealId());
                shoppingCart.setName(setmeal.getName());
                shoppingCart.setImage(setmeal.getImage());
                shoppingCart.setAmount(setmeal.getPrice());
            }
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartMapper.insert(shoppingCart);
        }
    }

    /**
     * 查看购物车
     * @return
     */
    @Override
    public List<ShoppingCart> showShoppingCart() {
        ShoppingCart shoppingCart = ShoppingCart.builder().userId(BaseContext.getCurrentId()).build();
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        return list;
    }

    /**
     * 清空购物车
     */
    @Override
    public void clean() {
        Long currentId = BaseContext.getCurrentId();
        shoppingCartMapper.deleteBycurrentId(currentId);
    }

    /**
     * 删除购物车中的一个商品
     * @param shoppingCartDTO
     */
    @Override
    public void delete(ShoppingCartDTO shoppingCartDTO) {
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
        shoppingCart.setUserId(BaseContext.getCurrentId());
        Long dishId = shoppingCartDTO.getDishId();
        if (dishId != null){
            //删除的菜品份数
            shoppingCart = shoppingCartMapper.getByDishId(dishId);
            if (shoppingCart.getNumber()==1){
                shoppingCartMapper.deleteBydishId(dishId);
            }
            shoppingCart.setNumber(shoppingCart.getNumber()-1);
        }else {
            //删除套餐份数
            Long setmealId = shoppingCartDTO.getSetmealId();
            shoppingCart = shoppingCartMapper.getBySetmealId(setmealId);
            if (shoppingCart.getNumber()==1){
                shoppingCartMapper.deleteBysetmealId(setmealId);
            }
            shoppingCart.setNumber(shoppingCart.getNumber()-1);
        }
//        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
//        if (list != null && list.size() == 1){
//            shoppingCart = list.get(0);
//            if (shoppingCart.getNumber() == 1){
//                shoppingCartMapper.deleteBycurrentId(shoppingCart.getUserId());
//            }
//        }
//        else {
//            Long dishId = shoppingCartDTO.getDishId();
//            if (dishId != null){
//                //删除的菜品份数
//                shoppingCart = shoppingCartMapper.getByDishId(dishId);
//                if (shoppingCart.getNumber()==1){
//                    shoppingCartMapper.deleteBycurrentId(shoppingCart.getUserId());
//                }
//                shoppingCart.setNumber(shoppingCart.getNumber()+1);
//            }else {
//                //删除套餐份数
//                Long setmealId = shoppingCartDTO.getSetmealId();
//                shoppingCart = shoppingCartMapper.getBySetmealId(setmealId);
//                if (shoppingCart.getNumber()==1){
//                    shoppingCartMapper.deleteBycurrentId(shoppingCart.getUserId());
//                }
//                shoppingCart.setNumber(shoppingCart.getNumber()+1);
//            }
//        }
        shoppingCartMapper.updateNumberById(shoppingCart);
    }
}
